Line compensated overdriving circuit of color sequential display and line compensated overdriving method thereof

Abstract

A line compensated overdriving circuit for use in a color sequential display is disclosed. The line compensated overdriving circuit comprises an overdrive unit, a line compensation generator, and a line compensated overdrive (LCO) processor. The overdrive unit receives previous data and present data to output overdrive data. The line compensated generator receives a line position of each pixel to output a line compensated factor, and the LCO processor receives the line compensated factor and the overdriven data to generate compensated data for the pixel. Thus, the line compensated overdriving circuit can eliminate the spatial intensity variations associated with the conventional color sequential displays.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The invention relates in general to overdriving circuits of color sequential displays, and more particularly to line compensated overdriving circuits of color sequential liquid crystal displays (LCDs).[0003]2. Description of the Related Art[0004]In recent years, the flat panel display (FPD) industry has been focused on developing liquid crystal displays (LCDs), especially on developing thin film transistor (TFT) LCDs, and hoping to replace the role of cathode ray tube (CRT) displays in video applications. Each pixel on a TFT LCD is provided with a switching transistor for enabling image data to be written into a panel of the display.[0005]One way of displaying the TFT LCD is to use color sequential technology. A typical frame for displaying a color image is divided into three subframes for the three primary colors of red, green and blue, and each subframe is further divided into a subframe writing period and a subframe ...

AI Technical Summary

Benefits of technology

The invention provides a new line compensated overdriving circuit and method for use in a color sequential display that can greatly reduce spatial intensity variations. This is achieved by using a line compensated overdrive circuit that includes an overdrive unit, a line compensation generator, and a line compensated overdrive processor. The overdrive unit receives previous data and present data to output overdrive data, and the line compensation generator receives the line position of each pixel to output a line compensated factor. The LCO processor then receives the line compensated factor and the overdrive data to generate compensated data to drive the pixel. The invention also includes a polarity checking unit in the overdrive unit that compares the previous data with the present data to output a polarity factor, which is used to generate the compensated data. The line compensated overdriving method involves the steps of receiving previous data, receiving present data, determining overdrive data, receiving a line position of each pixel, determining a line compensated factor, and outputting compensated data for the pixel. These features can help to improve the display quality and provide a better user experience for viewers.

Problems solved by technology

However, the color sequential display is likely to suffer spatial intensity variations, which may cause the bottom portion of the TFT LCD to appear dimmer.

Therefore, the pixels on the bottom lines, in case the line addressing sequence is from top to bottom, often do not have sufficient response times to appropriately charge the capacitors that are positioned at each pixel to set liquid crystals in the pixels to their light transmittive states for displaying the appropriate gray value.

Consequently, the bottom portion of the panel in the conventional color sequential display often appears dimmer.

Images